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https://issues.apache.org/jira/browse/LANG-59?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922864#action_12922864
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Henri Yandell commented on LANG-59:
-----------------------------------
This change should have been fixed in 2.2, though it'd be best to test on 2.4
and then let us know if you're still having trouble in a new JIRA issue.
> [lang] DateUtils.truncate method is buggy when dealing with DST switching
> hours
> -------------------------------------------------------------------------------
>
> Key: LANG-59
> URL: https://issues.apache.org/jira/browse/LANG-59
> Project: Commons Lang
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: Operating System: Windows XP
> Platform: Other
> Reporter: Li Zhang
> Fix For: 2.2
>
> Attachments: lang_issue_59.txt
>
>
> Try to truncate 2004-10-31 01:00:00 MDT by hour and you'll actually get
> 2004-10-
> 31 01:00:00 MST, which is one hour after the input hour.
> // truncate 2004-10-31 01:00:00 MDT
> Date oct31_01MDT = new Date(1099206000000L);
> Date result = DateUtils.truncate(oct31_01MDT, Calendar.HOUR_OF_DAY);
> assertEquals(oct31_01MDT, result);
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